What is a 'Head Loop Lashing' (Kopflasching / Kopfschlinge) under EN 12195-1, and when is it primarily applied?

1. A direct lashing strap placed across the upper front face of the cargo (often supported by an edge pallet or corner protector) and anchored rearward to create an artificial bulkhead when cargo cannot touch the front headboard
2. A strap wrapped tightly around the driver's headrest for ergonomic support
3. A top-over tie-down strap placed over the top of the tractor cabin
4. A vertical chain used only for lifting containers with cranes